Phytoremediation potential of Puccinellia distans (Jacq.) Parl in Cd contaminated soil and method of leaching reduction into ground waters

The aim of present study was to investigate phytoremediation potential of Puccinellia distans (Jacq) Parl using EDTA and DTPA and method of decreasing Cd- chelating leacing risk. The soil samples spiked with CdCl2. The treatments comprised the following dosages 2.5DTPA, 5DTPA, 2.5EDTA, 5EDTA, 2.5EDTA.5DTPA, 2.5EDTA, 5EDTA.5DTPA, 5EDTA and control pots were not treated with EDTA and DTPA. Bioconcentration factor (BCF), translocation factor (TF) and tolerance index (TI) were calculated to determine the Cd phytoremediation efficiency. Results indicated that EDTA and DTPA application significantly increased Cd content in the plant tissues and, root concentration of Cd was greater than the concentration in the shoot. The maximum bioconcentration factors (BCF) was observed in 5DTPA and 5EDTA respectively, and the maximum translocation factor (TF) was obtained for 5EDTA treatment. The results indicated that EDTA and DTPA had potential to promote the uptake of Cd by P.distans. In the next step to reduce leaching of Cd-chelate, 5mgkg-1 EDTA and DTPA in three ways of single, triple and six successive dosage were added to the soil. The results indicated that under single application, Cd content reached at its minimum concentration in the soil and, in the plant organs, the Cd concentration was the maximum. Metal concentration in the plant organs did not vary significant when triple and six successive dosage were added (p